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Igranic wave wound radio frequency coil

Three Colvern screened radio frequency coils

Radio Frequency Transformer

circa 1922

Colvern radio frequency coil wound on bakelite former with internal adjustable interchageable coupling coil

Pair of Gambrell plug-in radio frequency coils with holders

Pair of Gambrell plug-in radio frequency coils with holders

Gambrell plug-in radio frequency coil, one of a pair, with holder

Gambrell plug-in radio frequency coil

Gambrell plug-in radio frequency coil, one of a pair, with holder

Gambrell plug-in radio frequency coil